BE352471A

BE352471A -

Info

Publication number: BE352471A
Authority: BE

Description

       

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  Perfectionnement aux déterminateurs de temps de pose poar la   photographie.   



   Cette invention a trait aux régulateurs ou   détermi-   nateurs de temps de pose ou d'exposition, et plus spécialement à la combinaison d'un appareil photographique avec un photomètre. 



  Le photomètre mesure la   lumière   et règle antomatiquement la posi- tion du diaphragme de l'appareil   *-Photographique,   de sorte que ce la mise en position de /photomédtre détermine   simultanément   l'ou-   vertare   du   diaphragme/de l'appareil.   



   L'invention comprend aussi un dispositif permettant de trouver le temps de pose exact et pouvant être actionne manuel- lement 

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 lement et l'on peut , sans sortir du cadre de l'invention, faire en sorte que ce dispositif soit relié mécaniquement au dispositif de commande de l'obturateur de l'appareil en vue d'assurer le réglage convenable de cet obturateur, et par conséquent le régla- ge convenable de l'exposition. 



   Un autre bat de l'invention est de prévoir an pho- tomètre et un appareil photographique combinés, constituant un régulateur d'exposition, qui peut être installé sur des types nor- maux d'appareils photographiques, n'occupe qu'un faible espace et ne gêne en aucune façon le réglage, le reploiement ou d'autres manoeuvres ou opérations de   l'appareil.   En d'autres termes, l'in- vention comprend des moyens faisant partie de l'appareil photo- graphique et permettant à l'opérateur de mesurer exactement la lumière et, dans cette action, de régler la position du diaphragme, de cet appareil et aussi de trouver le temps de pose exact et de régler le dispositif de commande de l'obturateur d'une façon correspondante, ce qui supprime pratiquement les tâtonnements et l'incertitude du résultat dans la prise de vues. 



   En vue de ces divers buts et   d'autres,     l'inven-   tion consiste dans certaines caractéristiques de construction, combinaisons et dispositions de pièces qui seront décrites ci- après   d'une   façon plus détaillée en se référant aux dessins anne- xés dans lesquels : 
Fig. 1 est une vue de face d'un appareil photo- graphique muni du mécanisme suivant l'invention, 
Fig. 2 est une coupe longitudinale à travers le photomètre, 
Fig. 3 est une coupe suivant 3-3 (fig. 2), 
Fig. 4 est une coupe suivant 4-4 (fig. 1). 



   Fig. 5 est une coupe suivant la ligne   brisée-5-5   de 

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 de fig. 2 montrant le dispositif accessoire à lentille convergente monté sur le photomètre, 
Fig. 6 est une vue   schématique   représentant une dis- position simple de montage électrique pouvant être employée suivant l'invention. 



   1 représente la boîte d'un appareil photographique, 
2 le soufflet réglable, 3 l'anneau mobile qui détermine le fonction- nement du diaphragme 4, et 5 un index mobile servant à régler le temps de pose par le fonctionnement d'un obturateur de type normal. 



     L' anneau   porte aussi un index 6 qui se méat en re- gard d'une échelle 7 de l'appareil pour indiquer le diamètre de l'ouverture du diaphragme 4.8 est un poussoir commandant l'obtura- 'tear et 9 est du viseur .  Toutes   les pièces qui viennent d'être décrites constituent an type d'appareil;photographique normal qui n'a été choisi qu'à titre explicatif, étant donné que l'invention   pourrait   être appliquée à de nombreux types différents d'appareils, y compris les appareils de prise de vues cinématographiques, et .qu'elle ne doit pas   tre   considérée comme limitée à cet égard. 



   Les appareils photographiques du type décrit sont munis d'un cadre ou ossature 10 qu'on déplace vers   l'intérieur   ou vers l'extérieur pour développer ou contracter le soufflet 2.A cette ossature est fixé , d'un   côtë   de l'appareil, le photomètre perfectionné 11, tandis qu'on fixe de l'autre côté un boîtier de batterie de piles sèches   ]et   les dimensions de ces deux dispositifs étant telles qu'elles permettent à l'appareil d'être replié à   l'in-     térieur   de la botte 1. 



   On se référera maintenant plus particulièrement au photomètre suivant l'invention. On remarquera que ce photomètre comprend un corps cylindrique vertical muni d'une extrémité d'entrée 

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 de lumière inférieure qui est disposée à angle droit par rapport au corps vertical 11. Cette extrémité recevant la lumière peut constituer un couvercle 13 qui est démontable ou fixé à demeure dans l'extrémité du corps et qui possède une forme circulaire ou cylindrique et présente-une 'ouverture semi-circulaire et une partie pleine semi-circulaire 14. 



   A l'arrière de l'extrémité ou couvercle d'admission de lumière 13 est disposé un disque de discrimination 15 qui pos- séde un mouvement angulaire et qui est circulaire, une de ses moitiés étant transparente et l'autre opaque. A son extrémité in- férieure, le photomètre est muni, à l'arrière du disque 15, d'une paroi inclinée 16 présentant une surface terne qui dévie la   lu-   mière vers le haut à l'intérieur du corps cylindrique. 



   A ltavant du disque 15 se trouve un réflecteur 17 situé dans la moitié fermée de l'extrémité d'admission de lumiére, de sorte que les rayons lumineux émanant d'une ampoule électri- que   18   disposée dans une botte 19 sont dirigés   à   travers la par-- tie transparente du disque 15 par le réflecteur   17.   



   Entre les extrémités du corps 11 est prévu un second disque de discrimination 20 qui possède un mouvement angulaire et dont une moitié est transparente et l'autre opaque, et l'on a représenté une vis à tête 21 mobile à l'intérieur d'une fente 22 du corps 11 à titre d'organe de   manoeuvre   du disque 20 et une échelle 23 prévue à l'extérieur du corps 11 et en regard de laquel- le se meut la tête de la vis pour indiquer les temps de pose . 



  Le disque 20 effectue une diffusion en même temps qu'une discrimi- nation, mais il est nécessaire de prévoir quelque dispositif près de ce disque pour diffuser la lumière. 



   Le corps cylindrique 11 contient dans sa partie su- périeure un disque diffuseur 24 qui peut être fait de toute matière translucide 

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 translucide convenable. Le corps ou boîte du photomètre est divisé en deux moitiés allant du disque 24 à l'extrémité infé- rieure recevant la lumière, et pour diviser ainsi le corps, il est nécessaire   (Le   prévoir une cloison verticale   25   entre l'écran 
24 et le disque 20, une seconde cloison verticale 26 entre le dis- que 20 et le disque 15 et une troisième cloison 27 entre le dis- que 15 et l'extrémité du couvercle 13, le réflecteur 17 n'étant bien entendu situé que dans la partie fermée du couvercle. 



   Sur l'extrémité supérieure de la botte ou corps 
11 est prévu un organe 28 en forme d'entonnoir flexible, préféra- blement démontable, repliable ou mobile, à travers lequel l'opé- rateurraegarde pour observer les conditions de lumière qui règnent à l'intérieur du photomètre. 



   Le fonctionnement du photomètre est basé Par le principe suivant : La lumière de l'ampoule électrique 18 est de qualité connue et l'éclat ou intensité de la lumière externe est inconnu, mais on doit le faire entrer en ligne de compte pour déterminer la position   qu'il   convient de donner au diaphragme et le temps de pose convenable. Par l'éclairement de l'ampoule élec- trique 18, la différence est limitée à   l'une   des moitiés ou côtés du. photomètre, en raison de la présence des cloisons 25, 26, et   27     susmentionnées,   et les rayons lumieux émanant de l'extérieur sont séparés des rayons lumineux de l'ampoule électrique en raison de la présence de ces mêmes cloisons. 



   L'opérateur fait d'abord tourner le disque 20 jusqu'au temps de pose désiré et fait   ensuitemouvoir   l'organe de commande 35 jusqu'à un point tel que le disque diffuseur 24 soit uniformément éclairé ; ceci règle automatiquement le diaphragme à l'ouverture correcte et s'il n'est pas possible d'obtenir un éclairement 

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 éclairement égal , cela veut dire que le temps de pose choisi est impossible dans les conditions d'éclairage envisagées pour l'appareil . Dans ce cas, il faut   choiâir   un temps de pose plus long, sinon il n'est pas possible de prendre la vue. 



   Cette différence de lumière entre les deux moitiés du photomètre est évidemment due au mouvement de la partie opa- que du disque de discrimination, et quoique ces organes aient été mentionnés ci-dessus comme étant des disques munis de parties opaques et de parties transparentes, il est parfaitement évident qu'ils pourraient être construits autrement pour donner les mêmes résaltats et que l'invention n'est pas limitée au choix de cette expression. 



   Le disque de discrimination 15 est relié mécaniquement à l'anneau 3 commandant le diaphragme comme il va maintenant   être   décrit, de sorte que lea mouvements de ces organes sont simulta- nés et que le diaphragme est mis automatiquement en position se- lon le réglage du disque 15. 



   Un bras fendu 29 est fixé au disque 15 pour se moa- voir avec lui et est relié de façon pivotante par an axe 31 à l'extrémité inférieure d'une biellette 30 dont l'extrémité supé- rieure est reliée de façon pivotante à une lame de ressort 34 fixée à l'anneau 3, l'axe 31 se mouvant dans une fente formant came   32   pratiquée dans une plaque 33 fixée à l'extrémité infé- rieure du photomètre. 



   Une touche de manoeuvre 35 fixée à la lame de ressort 34 permet de manoeuvrer simultanément le disque 15 et le diaphra- gme de l'appareil. Le ressort 34 se comporte aussi à la façon d'un contact électrique normalement espacé d'une bande de contact cour- be 36 qui est isolée de l'appareil comme représenté. 



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Le boîtier 12 susmentionné contient tout nombre désiré de piles sèches, une des bornes de la batterie étant mise à la terre sur la   -'-masse-   de l'appareil et l'autre étant reliée à la bande de contact 36 par un circuit comprenant l'ampoule électrique 18. 



   Ce circuit est normalement ouvert , de sorte que la batterie ne tra- 
Taille que lorsqu'on effectue le réglage du diaphragme et du disque 15. Pendant cette opération la   touche-35   est poussée vers l'intérieur en même temps que déplacée evers le haut et vers le bas, de sorte que le circuit électrique est fermé pour allumer la , lampe électrique   18, pendant   le fonctionnement du photomètre. Aux autres moments, le circuit est ouvert. 



   La fig. 6 représente une disposition simple de schéma de montage électrique,   37   indique la batterie dont un des côtés est relié au ressort 34 et 1'autre à la plaque de contact 36 et comprend en circuit l'ampoule électrique 18. 



   Lorsqu'il est désirable de concentrer ou fixer une partie d'une scène avec une exactitude plus grande que d'autres, on peut utiliser un dispositif accessoire 38 tel que celui représenté dans la fig. 5 qui comprend une bonnette conique agencée pour   stem-.   boiter sur le couvercle 13 et portant une lentille 39 à son ex- trémité externe. 



   On a représenté une forme de réalisation préférée de l'invention, mais il est bien entendu, que l'invention est   sascep-   tible de recevoir d'adirés   tonnes   de réalisation et de nombreuses modifications sans s'écarter de son esprit. 



   REVENDICATIONS. 



   1  A titre d'objet de fabrication nouveau., la com- binaison d'un appareil photographique et d'un photomètre. 

**ATTENTION** fin du champ DESC peut contenir debut de CLMS **.



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  Improvement in exposure time determiners for photography.



   This invention relates to regulators or determiners of exposure or exposure time, and more especially to the combination of a camera with a photometer.



  The photometer measures the light and antomatically adjusts the position of the diaphragm of the device * -Photographic, so that the positioning of the / photometer simultaneously determines the opening of the diaphragm / of the device.



   The invention also comprises a device making it possible to find the exact exposure time and which can be operated manually.

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 Lely and it is possible, without departing from the scope of the invention, to ensure that this device is mechanically connected to the device for controlling the shutter of the apparatus in order to ensure the proper adjustment of this shutter, and therefore the correct exposure setting.



   Another bat of the invention is to provide a combined photometer and camera, constituting an exposure regulator, which can be installed on normal types of cameras, occupying only a small space. and does not interfere in any way with the adjustment, folding or other maneuvers or operations of the device. In other words, the invention comprises means forming part of the camera and allowing the operator to measure the light exactly and, in this action, to adjust the position of the diaphragm, of this apparatus. and also to find the exact exposure time and to adjust the shutter control device in a corresponding way, which practically eliminates the guesswork and the uncertainty of the result in the shooting.



   In view of these various objects and others, the invention consists of certain construction features, combinations and arrangements of parts which will be described in more detail hereinafter with reference to the accompanying drawings in which :
Fig. 1 is a front view of a camera fitted with the mechanism according to the invention,
Fig. 2 is a longitudinal section through the photometer,
Fig. 3 is a section along 3-3 (fig. 2),
Fig. 4 is a section on 4-4 (fig. 1).



   Fig. 5 is a cut along the broken line-5-5 of

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 of fig. 2 showing the converging lens accessory device mounted on the photometer,
Fig. 6 is a schematic view showing a simple electrical mounting arrangement which may be employed according to the invention.



   1 represents the box of a camera,
2 the adjustable bellows, 3 the movable ring which determines the operation of the diaphragm 4, and 5 a movable index serving to adjust the exposure time by the operation of a shutter of the normal type.



     The ring also bears an index 6 which turns against a scale 7 of the apparatus to indicate the diameter of the aperture of the diaphragm 4.8 is a pusher controlling the obturation and 9 is of the viewfinder . All the parts which have just been described constitute a normal type of photographic apparatus which has been chosen for explanatory purposes only, since the invention could be applied to many different types of apparatus, including cinematographic cameras, and that it should not be considered as limited in this respect.



   Cameras of the type described are provided with a frame or frame 10 which is moved inward or outward to develop or contract the bellows 2. This frame is fixed on one side of the camera. , the improved photometer 11, while a dry cell battery box is attached on the other side] and the dimensions of these two devices being such as to allow the apparatus to be folded up in- back of the boot 1.



   Reference will now be made more particularly to the photometer according to the invention. It will be noted that this photometer comprises a vertical cylindrical body provided with an inlet end

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 lower light which is disposed at right angles to the vertical body 11. This light receiving end may constitute a cover 13 which is removable or permanently fixed in the end of the body and which has a circular or cylindrical shape and has- a semi-circular opening and a solid semi-circular part 14.



   At the rear of the light inlet end or cover 13 is disposed a discriminating disc 15 which has angular movement and which is circular, one of its halves being transparent and the other opaque. At its lower end, the photometer is provided, at the rear of the disc 15, with an inclined wall 16 having a dull surface which deflects the light upwards inside the cylindrical body.



   In front of the disc 15 is a reflector 17 located in the closed half of the light inlet end, so that the light rays emanating from an electric bulb 18 disposed in a boot 19 are directed through the light. transparent part of the disc 15 by the reflector 17.



   Between the ends of the body 11 is provided a second discrimination disc 20 which has an angular movement and of which one half is transparent and the other opaque, and there is shown a head screw 21 movable inside a slot 22 of the body 11 as a maneuvering member of the disc 20 and a scale 23 provided outside the body 11 and opposite which moves the head of the screw to indicate the exposure times.



  Disk 20 diffuses simultaneously with discrimination, but it is necessary to provide some device near this disk to diffuse the light.



   The cylindrical body 11 contains in its upper part a diffuser disc 24 which can be made of any translucent material.

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 suitable translucent. The body or box of the photometer is divided into two halves going from the disc 24 to the lower end receiving the light, and to thus divide the body it is necessary (The provide a vertical partition 25 between the screen
24 and the disc 20, a second vertical partition 26 between the disc 20 and the disc 15 and a third partition 27 between the disc 15 and the end of the cover 13, the reflector 17 being of course only located in the closed part of the cover.



   On the upper end of the boot or body
There is provided a member 28 in the form of a flexible funnel, preferably removable, collapsible or movable, through which the operator looks in order to observe the light conditions which prevail inside the photometer.



   The operation of the photometer is based on the following principle: The light of the electric bulb 18 is of known quality and the brightness or intensity of the external light is unknown, but it must be taken into account to determine the position that should be given to the diaphragm and the suitable exposure time. By the illumination of the electric bulb 18, the difference is limited to one of the halves or sides of the. photometer, due to the presence of the aforementioned partitions 25, 26, and 27, and the light rays emanating from the outside are separated from the light rays of the electric bulb due to the presence of these same partitions.



   The operator first rotates the disc 20 to the desired exposure time and then moves the control member 35 to such a point that the diffuser disc 24 is uniformly illuminated; this automatically sets the diaphragm to the correct aperture and if it is not possible to obtain illumination

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 equal illumination, this means that the exposure time chosen is impossible under the lighting conditions envisaged for the device. In this case, you have to choose a longer exposure time, otherwise it is not possible to take the view.



   This difference in light between the two halves of the photometer is evidently due to the movement of the opaque part of the discrimination disc, and although these members have been mentioned above as being discs provided with opaque parts and transparent parts, it is perfectly obvious that they could be constructed otherwise to give the same results and that the invention is not limited to the choice of this expression.



   The discrimination disc 15 is mechanically connected to the ring 3 controlling the diaphragm as will now be described, so that the movements of these members are simultaneous and the diaphragm is automatically put in position according to the setting of the diaphragm. disc 15.



   A split arm 29 is attached to the disc 15 to move with it and is pivotally connected by a pin 31 to the lower end of a link 30, the upper end of which is pivotally connected to a rod. leaf spring 34 fixed to the ring 3, the axis 31 moving in a slot forming a cam 32 made in a plate 33 fixed to the lower end of the photometer.



   An operating key 35 fixed to the leaf spring 34 enables the disc 15 and the diaphram of the apparatus to be operated simultaneously. The spring 34 also behaves as an electrical contact normally spaced apart from a curved contact strip 36 which is isolated from the apparatus as shown.



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The aforementioned housing 12 contains any desired number of dry cells, one of the battery terminals being grounded to the apparatus ground and the other being connected to the contact strip 36 by a circuit comprising the light bulb 18.



   This circuit is normally open, so that the battery does not
Size as when adjusting the diaphragm and the disc 15. During this operation the key-35 is pushed inwards at the same time as moved up and down, so that the electric circuit is closed for light the electric lamp 18 while the photometer is in operation. At other times, the circuit is open.



   Fig. 6 shows a simple arrangement of an electrical circuit diagram, 37 indicates the battery, one side of which is connected to the spring 34 and the other to the contact plate 36 and comprises in circuit the light bulb 18.



   When it is desirable to focus or fix one part of a scene with greater accuracy than others, an accessory device 38 such as that shown in FIG. 5 which comprises a conical windshield arranged for stem-. limp on the cover 13 and carrying a lens 39 at its outer end.



   A preferred embodiment of the invention has been shown, but it is of course understood that the invention is susceptible to many other embodiments and numerous modifications without departing from its spirit.



   CLAIMS.



   1 As a new object of manufacture, the combination of a camera and a photometer.

** ATTENTION ** end of DESC field can contain start of CLMS **.

Claims

2 A <Desc / Clms Page number 8> 2 An exposure regulator for photographic apparatus, this regulator comprising a photometer and a device mechanically connecting the photometer and the device for controlling the diaphragm of the apparatus between them.

3 An exposure regulator for photographic devices, this regulator comprising a photometer, an electric lamp placed in this photometer, a battery of dry cells, a shutter control device mechanically connected to the photometer and constituting '' ' a circuit switch for the lamp.

4 An exposure regulator for photographic apparatus, this regulator comprising a photometer, an electric lamp placed in the photometer, a battery of dry cells, a shutter control device governing the operation of the photometer and the closing of the photometer. circuit leading to the lamp and a device supporting the photometer and the dry cell battery on the apparatus.

As a novel article of manufacture, the combination of a camera and a photometer, this photometer comprising a longitudinally divided sight tube or body comprising an artificial light, in one of its parts and admitting natural light to the other part, a discriminating disc which part is transparent and part opaque and which has an angular movement in the tube and a diffuser screen disposed in this tube.

6 An exposure regulator for photographic apparatus, this regulator comprising a photometer and a device; - operative connecting the photometer and the device for controlling the diaphragm of the apparatus between them, this photometer comprising a tube or. body <Desc / Clms Page number 9> longitudinally divided sight body, having an artificial light in one of its parts and admitting natural light to the other part, a discrimination disc of which a part is transparent and a part opaque and which has an angular movement in the tube and a diffuser screen arranged in this tube.

7 A display regulator for photographic cameras, this regulator comprising a photometer, an electric lamp disposed in this photometer, a battery of batteries Spades, a shutter control device mechanically connected to the photometer and constituting a circuit switch for the lamp, this photometer comprising a longitudinally dividing sighting tube or body, having artificial light in one of its parts and admitting natural light to the other part, a discrimination disc, one part of which is transparent and one opaque part and which has an angular movement in the tube and a diffuser screen disposed in this tube.

8 An exposure regulator for cameras, this regulator comprising a photometer, a dry cell battery / battery, a shutter control device governing the operation of the photometer and the closure of the circuit leading to the lamp and a device '. supporting .the photometer and the battery on the apparatus, this photometer comprising a tube, or sighting body divided longitudinally, comprising an artificial light in one of, its parts and admitting natural light to the other part, a discrimination disc, one part of which is transparent and one opaque part and which has an angular movement in the tube and a diffuser screen arranged in this tube.

9 The <Desc / Clms Page number 10> 9 The combination with a camera, a photometer attached to the camera, a discrimination disc movably mounted in the photometer, a leaf spring mounted on the diaphragm control device of the camera , a contact plate isolated from the device, a battery with one of its terminals grounded and the other connected to the plate, an arm fixed to the discrimination disc, a connecting rod - lette pivotally connected to the leaf spring and connected by a pin and slot assembly to the arm integral with the disc, the leaf spring being normally spaced from the contact plate and intended to be moved to adjust the position of the diaphragm, adjust the position of the discrimination disc and establish electrical contact with the plate,

and an electric lamp mounted in the photometer on the plate and battery circuit.

10 the combination with a photographic camera, a photometer attached to the apparatus, a discrimination disc movably mounted in the photometer, a leaf spring mounted on the control device of the. diaphragm of the device, a contact plate isolated from the device, a batteite having one of its terminals earthed and the other connected to the plate, an arm fixed to the discrimination disc, of a link pivotally connected to the leaf spring and connected by a pin and slot assembly to the arm integral with the disc, the leaf spring being normally spaced from the contact plate and intended to be displaced to adjust the position of the diaphragm,

adjust the position of the discrimination disc and establish electrical contact with the plate of an electric lamp mounted in the photometer on the plate and battery circuit and of a plate attached to the photometer and having a slit <Desc / Clms Page number 11> slot intended to receive the pivot connecting the rod and the arm between them.

The combination with a camera of a photometer mechanically connected to the camera and comprising a mechanical device which forces the diaphragm of the camera and the photometer to be actuated simultaneously, this photometer comprising a box, a diffusing nut placed inside this boot, means for directing the rays of an artificial light of known intensity towards a part of said screen, the other part of this screen being exposed to light which is to be measured, and means for gradually intercepting the light to be measured so that when all parts of the screen are illuminated in the same way, the position of the mobile device indicates the intensity of the light being measured. .

12 The combination with a camera of a photometer mechanically connected to the camera and comprising a mechanical device which forces the diaphragm of the camera and the photometer to be actuated simultaneously, this photometer comprising a box, a screen diffuser arranged inside this box means for directing the rays of artificial light of known intensity towards a part of said screen, the other part of this screen being exposed to the light which is to be measured , and means for gradually intercepting the material to be measured so that when all parts of the screen are illuminated in the same way, the position of the mobile device indicates the intensity of the light measured,

this mobile device comprising a partially transparent and partially opaque disc and a device which mechanically connects this disc to the mechanic controlling the diaphragm of the apparatus.

13 Combination with a camera; - views, a photometer mechanically connected to the camera and including <Desc / Clms Page number 12> ning a / mechanical device which forces the diaphragm of the apparatus the photometer to be actuated simultaneously, this photometer comprising a box, a diffusing screen disposed inside this box, means for directing the rays an artificial light of known intensity towards a part of said screen, the other part of this screen being exposed to the light which is to be measured, and means for gradually intercepting the light to be measured so that when all the parts of this screen the screen are lit in the same way, the position of the mobile device indicates the intensity of the light measured,

this mobile device comprising a partially transparent and partially opaque disc, a device which mechanically connects this disc to the control mechanism of the. diaphragm of the apparatus and a second disc similar to the disc mentioned in the first link and placed between the ends of the photometer boot, this second disc indicating the exposure time.

14 A photometer device established as an accessory for photographic cameras, this device comprising a tube or hollow body, longitudinal partitions dividing this body into two halves, this body having a light inlet opening at right angles through with respect to its main part, one half - == - = of this inlet port being closed, a discriminating disc having angular movement and located near the light inlet port of the body, a dull baffle placed at the angle of the body and intended to direct the rays of the material upwards inside the body, a reflector arranged in the closed part of the entry end of the photometer, an electric lamp directing its rays towards the reflector and a diffusing screen arranged in the upper part of the photometer.

15 A photometer device established as an accessory <Desc / Clms Page number 13> accessory for photographic cameras, this device comprising a tube or hollow body, longitudinal partitions dividing this body into two halves, this body having a light entry orifice at right angles to its main part, one half with this inlet orifice closed, a discriminating disc having an angular movement and located near the light inlet of the body, a dull deflector placed at the angle of the body and intended to direct the rays of light upwards 4 inside the body, a reflector arranged in the part formed by the inlet end of the photometer, an electric lamp directing its rays towards the reflector,

a diffuser screen disposed in the upper part of the photometer and a second discrimination disc placed between the ends of the boot of the photometer of the apparatus.

16 A photometer device established as an accessory for photographic cameras, this device comprising a tube or hollow body, longitudinal partitions, dividing this body into two halves, this body having an angled light inlet orifice straight, with respect to its principal part, one half of this inlet port being closed, a discriminating disc having an angular rudder and situated near the light inlet port of the body, a dull deflector placed at Strap of. body and for directing the light rays upwardly inside the body, a reflector disposed in the closed portion of the inlet end of the.

photometer, an electric lamp directing its rays towards the reflector, a diffusing screen disposed in the upper part of the photometer and a flexible conical sighting device mounted on the upper end of the body.

17 A photometer comprising: a box, a diffused screen <Desc / Clms Page number 14> sear disposed in this boot, means for directing rays of light of known intensity towards one part of this screen, the other part of the screen being exposed to the light which is to be measured and means for gradually intercepting the light to be measured such that when all parts of the diffusing screen are illuminated in the same way the position of the mobile device indicates the intensity of the light being measured.

18 A photometer comprising a boot, a diffuser screen disppsed in this boot, means for directing the rays of a light of known intensity towards a part of this screen, the other part of the screen being exposed to the. .meter to be measured and means for gradually intercepting the light to be measured so that when all parts of the diffusing screen are illuminated in the same way the position of the mobile device indicates the intensity of the light measured. , this mobile device comprising a disc which is partially transparent and partially ppaqae and an index connected to the disc and moving facing a scale carried by the boot.